
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

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Get yourself into Ali express and pick up the naturehike r5.8 for around £65. Packed size is 10cmx 16cm and total weight including the bag pump is 500g. That’s for the183cm mummy style , you’ll pay £10 more and gain 60grams for the rectangular one which packs down to 10x 18 cm or for another £10 there is a 196 cm length rectangular one that weighs 650gr and packs at13x22cm
Naturehike TuYe 5.8R 467g!
That's true. But you are looking in the budget section: it is ultralight, high R rating and budget category. You can't choose three things from price-quality-comfort trio.
I have one from flame's creed, 5.8R which is at 490g. There are several brands, but i think most pads that look similar and from a common (ali) brand sell the same pad, just under a different name. Had it for about 2 yrs now, and around 15-20 nights out. No failures so far, and didn't feel cold at lowest i encountered (3C). For me, it was a worth purchase and i'm satisfied with it.
I'm exactly the same height and almost the same weight as you and i'm also a side sleeper. I use Naturehike air mattresses. In Germany. I am happy with the price, quality and weight. The specifications according to Amazon: My 3.5R mummy one is 440g, my 5.8R rectangular one is 570g.
I am a side sleeper and I like Naturehike’s R5.8 mat
I'm 1.75cm x 70kg and I use the naturehike 5.8r, I find It quite comfortable and warm. You can find it around 90-100€, sometimes less depending on the offers

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series